The router fails to load a previously saved configuration. One of these error messages may be observed:
System Bootstrap, Version 11.1(8)CA1, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1) Copyright (c) 1997 by cisco Systems, Inc. Warning: monitor nvram area is corrupt ... using default values
Warning: NVRAM size is 0
environment checksum in NVRAM failed
%Error opening nvram:/startup-config (Invalid Checksum)
These error messages usually indicate a hardware failure. To verify, issue the test memory command. This is an example of the command output:
Test NVRAM card [y/n] ? y
Issue the write erase command and reload the router. If the issue persists, the hardware will need to be replaced.
When hardware replacement is indicated, perform one of these options:
- If you have a hardware support contract directly with Cisco for this part, use the Service Order Submit Tool to request a replacement part directly.
- For warranty service, contact the Cisco Technical Assistance Center (TAC) directly at 1-800-553-2447, or online by using the TAC Service Request Tool.
- If your product is not covered by contract or warranty, contact your Cisco partner or reseller to request a replacement part for the hardware component that is causing the issue.